I have the Phantom 1, purchased the Zenmuse with the upgraded board. Install went smoothly, or so I thought. But, when I turn on the Phantom the Zenmuse remains limp. I can hear they motors in the gimbal spinning and the GoPro does receive power. So, I figured the next step was to see if the firmware needed updating. Problem is, the NAZA assistant doesn't see the Phantom. When I power up the phantom my PC gives an error message that the USB device has an issue (don't remember the exact message). I did notice on the DJI site about adding the usbser.sys driver in the "C: \ WINDOWS \ system32 \ drivers" folder. That didn't seem to change anything. Anyhow, I obviously need some direction. If anyone can help with this issue I'd really appreciate it.